docs: def read_perseus(f):
      """
      Load a Perseus processed data table
  
      :param f: Source file
      :return: Pandas dataframe of imported data
      """
      df = pd.read_csv(f, delimiter='\t', header=[0,1,2,3], low_memory=False)
      df.columns = pd.MultiIndex.from_tuples([(x,) for x in df.columns.get_level_values(0)])
      return df